Definition
The section of the Code of Federal Regulations that sets the airworthiness standards for aircraft propellers. It specifies the design, construction, performance, and testing requirements a propeller must meet before the FAA will grant it a type certificate.
Plain English
The federal rulebook that says what a propeller must be able to do, and how it must be built and tested, before it can be approved for use on certified aircraft.
Context Anchor
Seen in aircraft design, certification, and airworthiness discussions when the FAA separates rules for aircraft, engines, and propellers.
Derivation
CFR stands for Code of Federal Regulations, the official collection of U.S. government rules. Title 14 covers Aeronautics and Space, and within it, Part 35 is the part dealing specifically with propellers. So '14 CFR part 35' is simply a precise address inside that rulebook.
Why Pilots Care
A propeller that does not meet Part 35 standards can prevent the aircraft from receiving or maintaining its airworthiness certificate.
Intuition Check
Do not read “part” as a physical part of the airplane here. In this term, “part” means a numbered section of the federal aviation rules.
Example Sentence 1
The propeller installed on the Cessna was certified under 14 CFR part 35 before being approved for production.
Example Sentence 2
During the preflight review the pilot noted that the propeller data plate referenced compliance with 14 CFR part 35.